http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Lee, Ki-Heon,Lee, Jeong-Hoon,Kang, Hee-Don,Park, Byoungnam,Kwon, Yongwoo,Ko, Heejoo,Lee, Changho,Lee, Jonghyuk,Yang, Heesun American Chemical Society 2014 ACS NANO Vol.8 No.5
<P>Green CdSe@ZnS quantum dots (QDs) of 9.5 nm size with a composition gradient shell are first prepared by a single-step synthetic approach, and then 12.7 nm CdSe@ZnS/ZnS QDs, the largest among ZnS-shelled visible-emitting QDs available to date, are obtained through the overcoating of an additional 1.6 nm thick ZnS shell. Two QDs of CdSe@ZnS and CdSe@ZnS/ZnS are incorporated into the solution-processed hybrid QD-based light-emitting diode (QLED) structure, where the QD emissive layer (EML) is sandwiched by poly(9-vinlycarbazole) and ZnO nanoparticles as hole and electron-transport layers, respectively. We find that the presence of an additional ZnS shell makes a profound impact on device performances such as luminance and efficiencies. Compared to CdSe@ZnS QD-based devices the efficiencies of CdSe@ZnS/ZnS QD-based devices are overwhelmingly higher, specifically showing unprecedented values of peak current efficiency of 46.4 cd/A and external quantum efficiency of 12.6%. Such excellent results are likely attributable to a unique structure in CdSe@ZnS/ZnS QDs with a relatively thick ZnS outer shell as well as a well-positioned intermediate alloyed shell, enabling the effective suppression of nonradiative energy transfer between closely packed EML QDs and Auger recombination at charged QDs.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2014/ancac3.2014.8.issue-5/nn500852g/production/images/medium/nn-2014-00852g_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn500852g'>ACS Electronic Supporting Info</A></P>
시맨틱 웹을 이용한 UML 기반의 웹 서비스 애플리케이션의 진화
이창호(Changho Lee),김진한(Jinhan Kim),이재정(Jaejeong Lee),이병정(Byungjeong Lee) 한국정보과학회 2007 한국정보과학회 학술발표논문집 Vol.34 No.2B
시장 적시성과 서비스의 품질을 만족하기 위해 웹 서비스는 서비스를 재사용하여 애플리케이션을 구성한다. 그리고 동적 진화(evolution)는 소프트웨어에 유연성을 제공하고, 계속 변경되어 예측하기 어려운 비즈니스 요구사항에 애플리케이션이 적응할 수 있도록 해준다. OWL 기반의 OWL-S(Web Ontology Language for Services)는 서비스를 기술하기 위한 온톨로지 언어이다. OWL-S의 의미적인 정보는 자동화된 시맨틱 웹 서비스의 발견과 호출, 서비스 조합을 위해 사용될 수 있다. 본 논문에서는 이러한 시맨틱 웹 서비스를 이용한 웹 애플리케이션의 동적 진화를 지원하는 프레임워크를 제안한다. 그리고 프로토타입을 통해 제안한 프레임워크의 타당성을 보인다.
스마트무인기 연료시스템 연료이송 제트펌프의 성능평가에 관한 실험적 연구
이윤권(Yoonkwon Lee),김의수(Euisoo Kim),박설혜(Sulhye Park),이지근(Jeekeun Lee),이창호(Changho Lee),이수철(Soochul Lee),최희주(Heejoo Choi) 한국항공우주학회 2007 韓國航空宇宙學會誌 Vol.35 No.12
스마트무인기 연료공급시스템에 사용되는 제트펌프의 연료탱크 사이의 연료이송 특성이 실험적으로 조사되었다. 제트펌프의 작동조건은 비행체의 임무에 따른 엔진의 요구사항을 만족하도록 설정되었으며, 주어진 조건에서 제트펌프의 성능을 평가하였다. 제트펌프의 유량비 변화에 따른 압력비 및 효율이 측정되었으며 면적비 변화 등이 고려되었다. 평가 결과로부터 제트펌프는 주어진 압력비보다 큰 범위에서 작동목표인 유량비 2.23을 만족하였다. 효율보다 연료공급량이 중시되는 연료이송 제트펌프의 경우 면적비 변화를 통하여 허용 압력비 범위 내에서 유량비 조절이 가능함을 알 수 있었다. The fuel transfer characteristics of the jet pump between fuel tanks, which is applied in the smart UAV fuel supply system, were experimentally investigated. The operating conditions of the jet pump were setup to meet the engine requirement according to mission profile, and the jet pump performance was evaluated at those conditions. The pressure ratio and the efficiency of the jet pump were measured with the variation of flow ratio. In addition, the area ratio was taken into the consideration to examine the effect on the jet pump performance. From the evaluation results, the jet pump met the fundamental requirement to transfer fuel with the flow ratio of 2.23. In the case of the jet pump that is focused on the fuel transfer quantity rather than its efficiency, the flow ratio would be adjusted through the variation of area ratio of the jet pump within the permitted limit of pressure ratio.
이일권(ILkwon Lee),국창호(Changho Kook),이정호(JeongHo Lee),함성훈(SungHoon Ham),이영숙(YoungSuk Lee),이승용(Seung Yong Lee) 한국자동차공학회 2023 한국자동차공학회 학술대회 및 전시회 Vol.2023 No.11
This paper is to study and analyze the change factor including with combustion engine to electric car. In recent, the fossil fuel that a great part of the energy source existence in the earth was brought on the global warming phenomenon endangering the survial of mankind. It was been at the end of one’s rope that a mankind had to change with the electric car for decreasing a CO2 from the emission gas in the vehicle. But for changing a electric car, the every nations in the world must devicefully resolve the reduced work problem and the derivation problem causing with decline of the petroleum consumption. Resulting do a survey for purchase reason of a electric car, the cost of fuel was investigated in the highest ratio of 56.5% in the survey. This is the most important factor for economical aspect like fuel expense reduction. To increase the electric car, the charge expense will be maintained with low price continuously. In the questionnaire survey analysis for the supply expansion of electric car, a charging station secure was investigated in the highest ratio of 44.7% in the survey. This can forecast to think more important the practical convience than the electric vehicle price and environmentfriendly awareness. The prospect of electric vehicle marcket is predicted that the car makers to live in heavy competition must quickly read the market situation and sales strategy in the world because of discrepancy reduction of technical between the conventional and new car makers.
스마트 무인기 연료계통 제트펌프 설계 및 성능예측에 관한 연구
이윤권(Yoonkwon Lee),박설혜(Sulhye Park),이지근(Jeekeun Lee),이창호(Changho Lee),최희주(Heeju Choi),이수철(Soochul Lee),정재헌(Jeahun Jeong) 한국자동차공학회 2007 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
This paper is concerned with the design and performance prediction of jet pumps for fuel system. The jet pump is important component to transfer the fuel between tanks in fuel supply system. However detailed design procedures for sizing the component of the jet pumps are known a little. In this paper the jet pump was designed according to the design procedure based on the theoretical analysis. For verifying the design results from the theoretical approach, the performance of the designed jet pump was predicted using a commercial analysis code and was verified through the experiment for the jet pump sizing with high performance. The flow ratio and pressure ratio were compared with target value and satisfied the demands in fuel supply system. Further research was carried out to obtain more conclusive information from various interference conditions and for improvement in performance.
이일권(ILkwon Lee),국창호(Changho Kook),이정호(JeongHo Lee),한성훈(SungHoon Ham),이영숙(YoungSuk Lee),이승용(Seung Yong Lee),박종철(Jong Chul Park),이광표(Kwang Pyo Lee) 한국자동차공학회 2024 한국자동차공학회 부문종합 학술대회 Vol.2024 No.6
This paper is to study and analyze the market analysis and drivers purchase trend on domestic electric car. By changing with electric car, the nation and industry compay must to the utmost efforts to maximize the driving distance and price competition intensification and charging efficiency and convenience of car improving the cars durability and the performance of battery. The proportion of eco-friendly car was verified with 82.% of tatal number that registered the 25.95millions in 2023 year. The proportion of electric car was equivalent to few 2.1% of registered number. Doing a survey for the driver, the ratio for people of having thought to buy the electric car were 76.70%. and the ratio for people of no having thought to buy electric car were 5.00% and the ratio for people of dont know on thought to buy car were 18.30%. Also, the reply of driver for buying wish the electric car in year was investigated with 8.70%. The reply of driver for buying with electric car was checked 25.00% changing a car with next car and 23.30% being in five year and 20.00% within a few decade and 23.00% after ten years. Therefore we will have competitive power to advance global electric car by optimizing in quality and constuct of variable infra in order to prepare the period of the electric car in future.
Changho Choi(최창호),Sangho Lee(이상호),Younghee Lee(이용희) 대한인간공학회 2021 대한인간공학회 학술대회논문집 Vol.2021 No.11
Objective: This study was conducted for the purpose of verifying the reliability of the inspection results when performing non-destructive inspection of API 2W 60 pipe welds according to the ISO standard PAUT procedure. Background: Radiography Test (RT) of welds has problems in terms of safety for the human body and limitations in the detection capability of plane defects. To supplement this, the PAUT test, which can acquire the test result data file, is used by replacing the film, which is the test record of RT. However, most of the studies on PAUT have been conducted based on the American Society of Mechanical Engineers (ASME) or American Society of Welding (AWS) codes. However, recent customer specifications require international ISO standards. Therefore, specific experimental analysis for the ISO standard PAUT procedure certification of the pipe welding part is absolutely necessary. Method: API 2W60 pipe calibration test specimen and ISO PAUT procedure accreditation test specimen were prepared with reference to previous studies on PAUT theory, research trends, and reliability analysis model of non-destructive testing. The acoustic anisotropy of TMCP steel and the transverse wave velocity of ultrasonic waves were measured using the calibration specimen. Next, the RT and PAUT volumetric non-destructive testing experiments were performed using the test specimens for approval, and the PAUT reliability was verified by comparative analysis of the measured results. Results: The effect of the acoustic anisotropy in the rolling direction and the direction perpendicular to the rolling direction of API 2W60 material on the change in the refraction angle of the ultrasonic beam and the speed of the transverse wave was confirmed. The reliability of PAUT inspection was secured by comparative analysis of RT and PAUT results related to the acceptance of ISO PAUT procedures for pipe welds. Conclusion: The acoustic anisotropy of API 2W60 material was confirmed by decreasing the measured refraction angle in the rolling direction and increasing the measured refraction angle in the transverse direction. In addition, as a result of a comparative verification experiment on RT and PAUT for pipe welds, the reliability of the PAUT result was high, so the verification of the ISO PAUT procedure was confirmed. Application: The contents and results of this study are expected to be utilized as an example of the application of ultrasonic inspection (UT) of welds of acoustic anisotropic materials. Furthermore, it is expected to be used in various ways for accreditation of ISO PAUT procedures for pipe welds.